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High-pressure Brillouin study on the orientationally disordered phase of methane

✍ Scribed by S. Sasaki; N. Nakashima; H. Shimizu

Publisher
Elsevier Science
Year
1996
Tongue
English
Weight
179 KB
Volume
219-220
Category
Article
ISSN
0921-4526

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✦ Synopsis

Three elastic constants in the orientationally disordered solid phase of methane have been determined at room temperature, as a function of pressure up to 5 GPa, by Brillouin spectroscopy developed for a single crystal grown in a diamond anvil cell. It is found that the velocity of the slow transverse acoustic mode in the (1 1 0) direction is insensitive to pressure as compared with other velocities, which leads to the anomalous increasing of the ratio of the longitudinal acoustic velocity to the slow transverse one in the (1 10) direction. This result suggests that the rotation-translation coupling has strong pressure dependence.

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## Abstract A semitheoretical method has been established for superimposing the residual thermodynamic properties of pure methane and of pure water over wide ranges of pressure (0.01 to 1,000 MPa) and temperature (triple point to twice the critical temperature). Using reasonable mixing rules with t